designate-agent: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/designate-agent - from package: designate-common

You may install the required package with command apt-get install {package}

Error in other languages:
designate-agent: bevel nie gevind nie
designate-agent: comandă negăsită
designate-agent: comando não encontrado
designate-agent: commande introuvable
designate-agent: command not found
designate-agent: käsku ei ole
designate-agent: không tìm thấy lệnh
designate-agent: komanda nerasta
designate-agent: Kommando nicht gefunden.
designate-agent: kommandot finns inte
designate-agent: komut yok
designate-agent: nie znaleziono polecenia
designate-agent: níor aimsíodh an t-ordú
designate-agent: no se encontró la orden
designate-agent: no s'ha trobat l'ordre
designate-agent: opdracht niet gevonden
designate-agent: parancs nem található
designate-agent: perintah tidak ditemukan
designate-agent: príkaz nenájdený
designate-agent: příkaz nenalezen
designate-agent: команда не найдена
designate-agent: командата не е открита
designate-agent: 命令找不到
designate-agent: コマンドが見つかりません